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Subject[PATCH 50/73] union-mount: Create whiteout on unlink() [ver #2]
Date
From: Valerie Aurora <vaurora@redhat.com>

Whiteout an unlinked directory entry in a union mounted file system.

Original-author: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/namei.c | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 586913f..ce941ac 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3333,11 +3333,6 @@ static long do_unlinkat(int dfd, const char __user *pathname)
if (nd.last_type != LAST_NORM)
goto exit1;

- /* unlink() on union mounts not implemented yet */
- error = -EINVAL;
- if (IS_DIR_UNIONED(nd.path.dentry))
- goto exit1;
-
nd.flags &= ~LOOKUP_PARENT;

mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
@@ -3356,6 +3351,10 @@ static long do_unlinkat(int dfd, const char __user *pathname)
error = security_path_unlink(&nd.path, path.dentry);
if (error)
goto exit3;
+ if (IS_DIR_UNIONED(nd.path.dentry)) {
+ error = do_whiteout(&nd, &path, 0);
+ goto exit3;
+ }
error = vfs_unlink(nd.path.dentry->d_inode, path.dentry);
exit3:
mnt_drop_write(nd.path.mnt);


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